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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
Published on: October 11, 2016
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Design and demonstration of phase gratings for 2D single grating interferometer
Optics Express
|December 25, 2015
Summary
This study demonstrates high-visibility self-images using phase gratings and multidot targets in a 2D interferometer. The method successfully generated differential phase contrast and dark-field images from a single X-ray exposure.
Area of Science:
- Physics
- Materials Science
- Optics
Background:
- Phase gratings are crucial optical elements for manipulating wavefronts.
- Interferometry techniques are essential for high-resolution imaging.
- Multidot metal targets offer unique properties for X-ray interactions.
Purpose of the Study:
- To investigate the performance of five phase grating types in a 2D interferometer.
- To evaluate the generation of self-images from multidot metal targets.
- To explore the capability of deriving multiple image contrasts from a single exposure.
Main Methods:
- Utilized a two-dimensional (2D) single grating interferometer.
- Employed stacked 1D π/2-phase gratings and a checkerboard π-phase grating.
- Examined multidot metal targets embedded in a diamond substrate.
Main Results:
- Achieved high-visibility (40%) multidot-pattern self-images, consistent with simulations.
- Successfully derived differential phase contrast and dark-field images in both x and y directions from a single image.
- Observed doubled X-ray intensity with face-centered-square multidot targets, enabling enhanced imaging.
Conclusions:
- The investigated phase gratings enable high-quality imaging in a 2D interferometer.
- Single-exposure generation of multiple image contrasts (absorption, differential phase contrast, dark-field) is feasible.
- Multidot metal targets, particularly face-centered-square configurations, enhance X-ray imaging capabilities.
